DibbleWhen to plant sweet potatoes in Zone 3
In Zone 3, the last spring frost usually passes around May 15 and the first fall frost arrives around September 15, leaving about 123 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Short, cool season. Start most warm crops indoors and protect from late frosts.
Planting windows for sweet potatoes in Zone 3
| Task | Window |
|---|---|
| Transplant | Jun 5 to Jun 19 |
| Estimated harvest | Sep 13 to Sep 27 |
The harvest estimate counts 100 days to maturity, then a picking window of about 14 days. These windows use typical frost dates for Zone 3; Dibble pins them to your exact ZIP code.
Get reminders for these exact dates
Dibble turns your ZIP code into a full planting calendar and reminds you on the right day. Free to start, no account needed.
Sweet Potato in a Zone 3 season
Zone 3 gives about 123 frost-free days. Sweet Potato needs roughly 100 days from transplant. That leaves about 23 days of slack, enough for one full crop with a little room for a cold spring.
How to grow sweet potatoes
Plant slips 3 weeks after last frost when soil is thoroughly warm. Harvest before the first fall frost nips the vines.
Companion plants
Good neighbors for Sweet Potato:
Better kept apart:
Sweet Potato in other zones
Not in Zone 3? Pick your zone for the same dated windows.
Keep exploring
Sweet Potato: the full growing guide · The Zone 3 planting calendar · Every crop and zone
Plant at the right time this season
Dibble builds your calendar in under a minute. Free to start, no account needed.
Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.